Is there an equivalent to Lisp's "runtime" primitive in Scheme?

Posted by Bill the Lizard on Stack Overflow See other posts from Stack Overflow or by Bill the Lizard
Published on 2010-02-03T20:16:08Z Indexed on 2010/06/08 2:12 UTC
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lisp

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Scheme

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plt-scheme

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sicp

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racket

According to SICP section 1.2.6, exercise 1.22:

Most Lisp implementations include a primitive called runtime that returns an integer that specifies the amount of time the system has been running (measured, for example, in microseconds).

I'm using DrScheme, where runtime doesn't seem to be available, so I'm looking for a good substitute. I found in the PLT-Scheme Reference that there is a current-milliseconds primitive. Does anyone know if there's a timer in Scheme with better resolution?

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